package com.gw.mvc.servlet;

import java.io.IOException;
import java.util.Map;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.gw.mvc.bean.ConfigBean;
import com.gw.mvc.conn.Action;
import com.gw.mvc.form.ActionForm;
import com.gw.mvc.unit.FullBean;

public class DispatchServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public DispatchServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		System.out.println( ">>>>> request url :" + request.getServletPath() );
		String path = this.getPath( request.getServletPath() );
	    Map<String,ConfigBean> xmlMap = (Map<String,ConfigBean>)request.getAttribute("configMap");
	    ConfigBean configBean = xmlMap.get( path );
	    ActionForm actionForm = FullBean.full(request, configBean.getBeanClass());
	    
	    Action action = null;
	    String forwardUrl = null;
	    try {
			Class clazz = Class.forName( configBean.getActionClass() );
			action = (Action)clazz.newInstance();
			forwardUrl = action.execute(request, response, actionForm , configBean.getForwardMap() );
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			System.out.println( ">>>>> action Error .... ! " );
		}
		System.out.println( ">>>>> forward url :" + forwardUrl );
		RequestDispatcher dispatcher = request.getRequestDispatcher( forwardUrl );
		dispatcher.forward(request, response);
		
	}
	
	/**
	 * @param path
	 * @return
	 */
	private String getPath( String servletPath ){
		return servletPath.split( "\\." )[0];
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		this.doGet(request, response);
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}
